A Chachee
A chachee is a person who thinks they're a rockstar but can't even finish a song. They try to do everything at once and end up looking like a fool.
He tried to juggle, rap, and do push-ups at the same time. It was a disaster.
She took on five projects at once and ended up dropping all of them.
He signed up for a marathon and a cooking show. He didn't finish either.